Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income	$ 148,388	$ 116,891
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	12,888	11,617
Amortization	938	743
Share-based compensation	6,481	6,299
Equity earnings in unconsolidated investments, net	(106)	(78)
Other	1,861	2,122
Changes in operating assets and liabilities, net of effects of acquisitions:
Receivables	(210,327)	(199,055)
Product inventories	(76,286)	(53,546)
Prepaid expenses and other assets	2,100	(2,389)
Accounts payable	55,964	38,673
Accrued expenses and other current liabilities	21,290	37,378
Net cash used in operating activities	(36,809)	(41,345)
Investing activities
Acquisition of businesses, net of cash acquired	(578)	(3,296)
Purchase of property and equipment, net of sale proceeds	(24,620)	(34,495)
Other investments, net	0	3
Net cash used in investing activities	(25,198)	(37,788)
Financing activities
Proceeds from revolving line of credit	554,536	606,623
Payments on revolving line of credit	(545,574)	(641,752)
Proceeds from asset-backed financing	177,500	156,600
Payments on asset-backed financing	(60,000)	(20,100)
Proceeds from short-term borrowings and current portion of long-term debt	13,957	22,609
Payments on short-term borrowings and current portion of long-term debt	(3,330)	(8,813)
Payments of deferred and contingent acquisition consideration	(265)	(199)
Payments of deferred financing costs	(8)	0
Purchase of redeemable noncontrolling interest	0	(2,573)
Proceeds from stock issued under share-based compensation plans	9,383	7,502
Payments of cash dividends	(33,194)	(28,108)
Purchases of treasury stock	(38,876)	(8,672)
Net cash provided by financing activities	74,129	83,117
Effect of exchange rate changes on cash and cash equivalents	105	726
Change in cash and cash equivalents	12,227	4,710
Cash and cash equivalents at beginning of period	29,940	21,956
Cash and cash equivalents at end of period	$ 42,167	$ 26,666

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Repayments Of ShortTerm Borrowings Long Term Debt And Repayments Of Notes Payable

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The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.

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The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets.

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The cash outflow to reacquire common stock during the period.

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The cash outflow for loan and debt issuance costs.

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